Agamma-ray photon changes into a proton-antiproton pair. ignoring momentum conservation, what must have been thewavelength of the photon (a) if the pair is stationary after creation, and (b) if each moves off at 0.6c. perpendicular to themotion of the photon? (c) assume that these interactions occur as the photon encounters a lead plate and that a leadnucleus participates in momentum conservation. in each case, what fraction of the photon’s energy must be absorbed bya lead nucleus?